timeouts when using secondary dns

[stucky]

Yey !! That totally did it. Thx AZ I hadn't even considered messing with the
resolver cuz I was sure it was a nagios issue so I had to fix nagios.
If that wasn't a text book example of how well mailinglists can work then I
don't know what is...

thx

On 11/7/06, Az <az at whoever.org> wrote:
>
> stucky wrote:
> > I use the check_by_ssh plugin for most of my stuff and I noticed that
> > if the primary nameserver is unavailable nagios starts freaking out.
> > All of a sudden all plugins time out. I tested it using the 'host'
> > command and it only takes about 1 second longer to lookup hosts using
> > the secondary nameserver.
> > The default timeout for check_by_ssh is 10 seconds. I cranked it up to
> > 30 and still I get timeouts. I'm not sure I understand that one.
> > Has anyone else seen this.
> We had a similar issue in that our primary DNS was doing strange things,
> and it quite often took 5 or even 10 seconds to perform a DNS lookup.
> What we were seeing was 70% of service checks (and subsequently host
> checks) failing by timing out. The key was the multiple of 5 seconds.
> The resolver timeout on, say, RHEL3 is based on RES_TIMEOUT in
> resolv.h... which was 5 seconds.
>
> We added the following to our resolv.conf, and found the problems went
> away:
>
>     options timeout:2 rotate
>
> This sets the timeout for waiting for a reply to 2 seconds, and tells
> the resolve to rotate through your 'nameserver' entries rather than
> always hitting #1, then #2, etc.
>
> Cheers.
>
>
>
>
>


-- 
stucky
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